One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,12,14)(11,13,15,16)(17,18,23,26)(19,24,30,32)(20,21,25,22)(27,29,31,28)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19,23,30)(18,24,26,32)(20,27,25,31)(21,29,22,28)(10,14)(11,15)(17,20)(18,21)(19,27)(22,26)(23,25)(24,29)(28,32)(30,31) involution — undirected(1,3,4,7)(2,6,5,8)(10,14)(13,16)(19,28)(20,25)(21,22)(24,27)(29,30)(31,32)(2,5)(6,8)(17,21,23,22)(18,25,26,20)(19,29,30,28)(24,31,32,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.